Engine code P0420
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Freshman User
Joined: Aug 2000
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Engine code P0420
Read and cleared engine code P0420. I drove it for a few days and the engine symbol is back on my dash. I have not read the code today, but feels like a P0420.
Ideas
2007 Expedition EL
Ideas
2007 Expedition EL
Thread Starter
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Freshman User
Joined: Aug 2000
Posts: 38
Likes: 1
I should say I think it is the same code.
There are a few possibilities and I am hoping to narrow it down if possible. Is it an O2 sensor or has someone had other troubles after getting this code?
Kevin
There are a few possibilities and I am hoping to narrow it down if possible. Is it an O2 sensor or has someone had other troubles after getting this code?
Kevin
Posting Guru
Joined: Oct 2003
Posts: 1,332
Likes: 4
From: Baltimore
Unless you have a scanner that can monitor the O2 sensors, I would replace the sensors. The ECM monitors front and rear sensors, and compares readings to determine if the converter is doing its job. Does the vehicle have, or ever had, a misfire problem? If not repaired quickly, the converter can be damaged and cause a cat efficiency problem that may not show up for some time
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